Intralaminar dural haemorrhage

Intralaminar dural haematomas in the intracranial space, are exceedingly rare, and represent haemorrhage between the two layers of the dura. As a result it has distinctive features allowing it to be distinguished from extradural haematomas, but mimics subdural haematomas. They are equivalent to epidural haematomas of the spine. 

Pathology

The haematoma occurs within the extradural neural axis compartment, located between the visceral layer (true dura or dura propria) and the parietal layer (cranial periosteum) - see dura mater article - and as such is actually in the same compartment as spinal epidural haematomas (rather than extradural haematomas that represent subperiosteal haematomas on the inside of the skull). 

Radiographic features

Unlike extradural haematomas, intralaminar haematomas are not confined by sutures, but extend to the dural sinuses (they are within the same space as the sinuses). 

Unless a subdural haematoma is also present, they can be difficult to separate from true subdural haematomas (which occur between the arachnoid layer and the inner layer of the dura), as both will cross sutures, but be confined by dural sinuses. 

Stroke and intracranial haemorrhage
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Article information

rID: 40107
Section: Gamuts
Synonyms or Alternate Spellings:
  • Intralaminar dural haematoma
  • Intralaminar dural hemorrhage
  • Intralaminar dural hematoma

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